Myopia Profile

Clinical

Communicating with an ophthalmologist about orthokeratology

Posted on February 25th 2021 by Connie Gan

In this article:

How do you approach communicating with an ophthalmologist about orthokeratology when they appear to have advised a parent against it?

Orthokeratology (OK) lenses are often prescribed to slow myopia progression in children. However, OK can have a perception of being unsafe for children, especially outside of primary eye care. If a patient is receiving conflicting recommendations from an optometrist and ophthalmologist, how can you bridge the gap to ultimately find the best solution for the patient?

In this post on the Myopia Profile group, RH is asking for advice on communicating with an ophthalmologist about orthokeratology, where it seems the ophthalmologist is against OK fitting in children.

RH Dear group I would be grateful if someone could point me to the latest and most convincing orthok studies for my local ophthal who is strongly against orthok. Many thanks in advance

Safety of orthokeratology

A real and valid concern about orthokeratology is the safety profile in children, and a key cause for objection. The most concerning complication of OK lens use is microbial keratitis (MK) as it can be sight-threatening infection.1

MK is typically associated with lack of practitioner and wearer training, improper fitting procedures, poor compliance to lens care and maintenance, and lack of routine follow up.2

An explosion of case reports of infections in childhood OK wear infections occurred in the early 2000's in East Asia, where these causative risk factors were wide spread, and resulted in the China Food and Drug Administration (FDA) commencing regulation of the practice of OK from 2002.3

Back in 2005, orthokeratology for myopic children was even termed a 'wolf in sheep's clothing'!4 Since then, though, an average of 50 peer-reviewed publications per year on orthokeratology has established its efficacy in both myopia correction and control, along with determining the incidence of complications.5

The safety of modern, regulated orthokeratology practice in children is around 1 per 1,000 patient wearing years,6 which is similar to the risk in reusable silicone hydrogel daily soft contact lens wear. Read more about this in Contact Lens Safety in Kids.

Efficacy of orthokeratology

Orthokeratology has been shown to be effective in slowing axial elongation in myopic children by around 50% over two years, according to meta-analyses.7-9

Discontinuation of OK wear before age 14 has shown a type of 'rebound' effect, although with axial growth similar to that of single vision spectacle lens wearers. Slower progression was again gained on resumption of OK wear after a period of cessation.10

Benefits of orthokeratology

Since orthokeratology lenses are effective in slowing axial length growth, reducing final level of myopia will also reduce a patient's lifelong risk of myopia-associated eye diseases like cataract, retinal detachment and myopic macular degeneration.

A comparison has been undertaken of the short-term risks of myopia controlling contact lens wear with the long-term risks of higher levels of myopia. Gifford's analysis on the Childhood and lifetime risk comparison of myopia control with contact lenses utilized peer reviewed data on contact lens safety in children and adults, alongside findings of the cumulative risk of vision impairment by age 75, based on axial length and level of myopia.11

When only 10 years of childhood CL wear was considered (age 8-17 inclusive), the likelihood of one case of MK (with 95% confidence intervals) was:

  • 1 in 431 for daily disposable soft contact lenses (316, 511)
  • 1 in 116 for reusable soft contact lenses (40, 517), and
  • 1 in 67 for orthokeratology wear (19, 379).

Since the confidence intervals overlap, reusable SCLs and OK were concluded to be likely of a similar safety profile.

By comparison, the lifetime risk of vision impairment is:

  • 1 in 18 for myopes of 3-6D (12, 39)
  • 1 in 5 for myopes 6-10D (3, 12)
  • 1 in 4 for axial lengths 26 to less than 28mm (2, 19)

If contact lens wear was commenced at age 8 for myopia control, and continued throughout life until age 65, the risk of MK of any type of contact lens wear is less than the lifetime risks of vision impairment from myopia-associated pathology when myopia is over 3D or axial length in excess of 26mm.11 This presents a clear case for the long-term benefits of wearing myopia controlling contact lenses like orthokeratology.

Regarding short-term benefits, OK is a very convenient method of vision correction for patients who engage in sport or have active lifestyles, as it eliminates reliance on optical correction during waking hours.

Orthokeratology can be combined with atropine

Combining orthokeratology with 0.01% atropine has shown an additive myopia controlling effect, compared to orthokeratology alone, in retrospective studies12 and newly published randomized clinical trials.13,14

Two year data indicated that the combined treatment slowed axial elongation by 0.18mm over two years in children who were 1-3D myopic at baseline, but had no significant effect for children who were 3-6D myopic at baseline, who progressed more slowly than the low myopes over the study. There was no effect of age - younger children didn't have a stronger effect than older children. The authors concluded that "combination therapy may be effective for slowing axial elongation, especially in children with low initial myopia."14

There is early data on combining multifocal soft contact lenses with 0.01% atropine,15 but at this stage orthokeratology is the only intervention for which efficacy in combination with atropine has been indicated.

.

How does RH's story end?

RH Just letting you all know. I got a formal response from the ophthal. He said he is not against ortho K at all (he was just not sure it would work on her as she had 2 years of streff. True, while she was having streff, it was impossible to measure her but she has now returned to 6/6 VA so I don't see a problem there.) The moral of the story, never trust what your patient tells you lol(who was 100%sure he told her that ortho K is a no for her daughter). But at least now I am armed with studies to show any parents who question. Thank you to all that helped me.

It turns out that the ophthalmologist in question did not think orthokeratology would be unsuitable in general, but rather for this specific patient - his position was misunderstood or miscommunicated by a parent. This highlights the importance of maintaining open and respectful communication between ophthalmologists and primary eye care practitioners. In either case, it is ideal not to assume the reasons for another practitioners' opposition or to be overly defensive. When communicating with an ophthalmologist about orthokeratology, remember that we are all on the same side - with the best interests of our patients being the key intention.

Take home messages:

  1. While there is a risk of microbial keratitis with orthokeratology use, it is relatively low, and can be managed through proper fitting processes, lens care and maintenance procedures and regular aftercare.
  2. Orthokeratology is an effective myopia control strategy, with the short-term and long-term benefits arguably outweighing the short-term risks. It is also the only intervention for which evidence exists of increased efficacy when combined with 0.01% atropine, especially for low myopes.
  3. Open lines of communication between eye care practitioners ensure the best chance for ideal patient outcomes.

Meet the Authors:

About Connie Gan

Connie is a clinical optometrist from Kedah, Malaysia, who provides comprehensive vision care for children and runs the myopia management service in her clinical practice.

Read Connie's work in many of the case studies published on MyopiaProfile.com. Connie also manages our Myopia Profile and My Kids Vision Instagram and My Kids Vision Facebook platforms.

About Kimberley Ngu

Kimberley is a clinical optometrist from Perth, Australia, with experience in patient education programs, having practiced in both Australia and Singapore.

Read Kimberley's work in many of the case studies published on MyopiaProfile.com. Kimberley also manages our Myopia Profile and My Kids Vision Instagram and My Kids Vision Facebook platforms.


Back to all articles

Enormous thanks to our visionary sponsors

Myopia Profile’s growth into a world leading platform has been made possible through the support of our visionary sponsors, who share our mission to improve children’s vision care worldwide. Click on their logos to learn about how these companies are innovating and developing resources with us to support you in managing your patients with myopia.